Some standard content:
SY/T5475-92, Standard of Petroleum and Natural Gas Industry of the People's Republic of China
Technical requirements for liner cementing
Published on September 17, 1992
Ministry of Energy of the People's Republic of China
Implementation on February 1, 1993
1 Subject content and scope of application
Technical requirements for liner cementing of Standard of Petroleum and Natural Gas Industry of the People's Republic of China
SY/T5475-92www.bzxz.net
This standard specifies the factors for selecting the type of liner, the factors for selecting the type of pipe spreader, the process design of liner cementing and the operation of liner cementing.
This standard is applicable to liner cementing of two types of liner hangers, hydraulic and mechanical, and can also be used as a reference for liner cementing operations of other types of hangers.
2 Reference standards
SY/T5322 Casing string strength design method
SY/T5331 Casing centralizer installation spacing calculation methodSY5198 Drilling tool thread tire
SY5199 Casing thread sealing grease
SY/T5374 Oil and gas cementing pre-injection fluid use method 3 Terminology
3.1 Liner
Oil and gas casing, the casing section that does not extend to the wellhead is called the liner (liner) 3.2 Elastic shortening After the tail pipe is suspended on the inner wall of the outer casing, in order to unload the tail load on the drill string, the drill string must be lowered a certain distance, which is called the "retraction distance".
3.3 Setting collar (tie-backsleeve) is a device set at the top of the hanger for the same connection of the casing. After the tie-back, it can meet the sodium internal pressure requirements of the pipe string. 3.4 Lapping interval
The casing section where the suspended tail pipe overlaps the outer casing. 3.5 Landing collar
It is equivalent to the flow blocking ring of the casing cementing, which provides collision pressure for the tail pipe bite plug. After the collision, a positive repulsion seal and a return seal can be formed, and a sealing ball seat can also be provided.
3.6 Extra cement extra-cement
To improve the sealing quality of the overlapping section annulus: additional cement exceeding the design amount. 4 Factors for selecting tail pipe type
4.1 Drilling tail pipe
a. Seal circulation loss, abnormal high pressure, severe sub-collapse, plastic formation and severe key well section, etc.; b. Economic requirements;
Approved by the Ministry of Energy of the People's Republic of China on September 17, 1992 and implemented on February 1, 1993
c. Need to use composite drill string,
d. Improve the hydraulic conditions of the well:
e: Control casing wear (to meet the needs of later connection). 4.2 Production tail pipe
a. Seal oil, gas and water layers
b. Economic requirements,
c. Reduce the requirements for the connection strength of the casing in the tie-back section d. Sufficient use of composite oil pipe;
e. Improve the hydraulic conditions of the cement ring,
f. Improve the weight loss of cement after setting.
Factors for selecting the type of liner hanger
Hydraulic type
a. Extended wells, inclined wells, horizontal wells,
b: Wells where the liner is lowered again in the wellbore
c, Wells prone to sticking and complicated drilling conditions, d, Semi-submersible drilling ships.
5.2 Mechanical type
a. Straight wells and wells with stable downhole conditions
b, Long liner and large liner!
c. Wells with annular gaps of 19mm
d. Wells not prone to sticking.
Tail cementing process design
6.1 Tail strength design
$Y/T 5475—92
The tail strength design shall be carried out in accordance with the provisions of Chapters 5 and 6 of SY/T5322. 6.2 Pipe string structure and requirements
6.2.1 Tail pipe size selection and annular gap
a. Tail pipe size selection see Table 1,
Concrete size
Casing size,
Total eye size
Annular flow area
Annular penetration gap
SY/T 5475-92
b. When the annular gap is less than 19mm and the eye cannot be expanded, the tail pipe size selection sees No. 2 in Table 1, C. After hanging, the minimum flow area at the slip suspension torsion shall not be less than 60% of the minimum annular gap area of the overlapping section. 6.2.2 Overlap section length
a: Control length: 50~150ms
b. If it is greater than 150m, the increase in flow resistance and economy should be considered. If it is less than 50m, the design amount of excess cement should be increased. 6.2.3 The amount of the card hanging position
The card hanging is selected in the thick wall section of the outer casing, and the mud bonding quality is good, and the position of the coupling is staggered, and it complies with the provisions of Article 6.2.2. 6.2.4 The back pressure seal is installed, and the spacing and spacing are
disordered. There should be at least two back pressure seals, namely the floating shoe (guide shoe) and the floating collar (seat coupling), and the tail pipe glue ink can form a third seal after colliding with the seat coupling.
b The maximum outer diameter of the floating shoe and the floating collar does not exceed 4mm of the tail pipe coupling, and the maximum outer diameter of the rigid straightening detent and the seat ring on the hanger is less than the minimum inner diameter of the outer casing by 5~~6mms
c. The distance from the choke ring (floating collar) to the tail pipe shoe (floating shoe) is controlled within the range of 30~50m. 6.2.5 Tail pipe string centralizer setting
The number and position of setting shall be calculated according to Chapter 5 of SY/T5334, and centralizers shall be added at both ends of the overlapping section. 6.2.6 Tail pipe shoe selection
a. Normal well: select white-filled or non-self-filled conventional floating shoes, b. For complex wells, select non-white-filled, special floating shoes with side holes with blade openings. 6.2.7 Seat ring (return connection)
When the tail pipe needs to be returned, the hanger used shall be equipped with a seat ring, the hole of which has a polished socket of not less than 150~300mm, and the inner diameter of the return connection shall be kept consistent with the inner diameter of the tail pipe after insertion. 6.2.8 Inner diameter and strength of the hanger body
The inner diameter of the body shall be equal to or equal to the minimum inner diameter of the pyrotechnic rat tube, and the use strength shall meet the requirements of tensile resistance, anti-extrusion and internal pressure resistance. 6.3 Preparation before liner lowering
6.3.1 Drilling fluid performance
The drilling fluid performance should meet the design requirements for lowering the liner. The mud cake friction coefficient is less than 0.1, the sand content is less than 0.3%, and the high temperature and high pressure filtration loss is less than 12ml.
6.3.2 Lowering data
Collect relevant data, especially the accurate well diameter data and the outer casing and the formation fracture pressure and formation pore force data at the deep drilling depth.
6.3.3 Inspection of outer casing
. Cement return depth, sealing quality!
b, segmented steel grade wall thickness and wear: pressure test inspection should be carried out when necessary; c. Use a 4mm inner diameter gauge smaller than the inner diameter of the outer casing to pass the test, and the test depth exceeds the well depth of the hanging liner. 6.3.4 Inspection and weighing of the sent drill string
a. The strength and sealing meet the operation requirements, and the length is checked, and the drill string is sent down and numbered: b. Calculate the maximum allowable torque and number of turns of the undercut, c. Weigh the drill string sent down (record the hanging weight) d. Use an inner diameter gauge 3mm smaller than the minimum inner diameter of the drill string to pass all. 6.4 Cement injection design
6.4.1 Cement slurry design
6.4.1.1 Cement slurry quantity
According to the calculation of the electric measurement and diameter, the additional coefficient of the bare limit section is controlled at 5%~8%. There must be excess cement in the total cement design, and the maximum excess 3
is less than the 150m annular capacity of the sent drill string and the outer casing. 6.4.1.2 Temperature calculation
SY/T 5475-92
The liner cementing cycle temperature is higher than the casing cementing temperature. The calculation is shown in formula (1) BIICT=(T.+8°C) +..
Where: RHCT—highest cycle temperature, °CT. ——Circulation outlet temperature, \C
D-liner shoe depth, 11
6.4.1.3 Thickening time and strength test
a. Calculate the temperature at the bottom of the well and the depth of the coiler: b. Carry out the thickening test under the condition of the highest cycle temperature D
C. Carry out the bed strength test under the condition of static temperature at the bottom of the well and the depth of the coiler. 6.4.1.4 Density design
a. Prepare the corresponding density according to each level of cement. In order to meet the requirements of balanced pressure solidification, the density can be adjusted by admixtures and external additives. Its compressive strength shall not be less than 14MPa.
b. When the static temperature exceeds 110°C, silica powder shall be added to the cement. c. Blocking materials are not allowed to be added to the water filter.
6.4.1.5 Thickening time regulations
a. Thickening time is equal to construction time plus additional safety time: b. Construction time is the time from the start of mixing cement slurry to the time when the central pipe is lifted out of the suspension device and the pump is turned on to flush the excess cement, c. The additional safety time is controlled within the range of 1.0~～2.0h. 6.4.1.6 Water loss control
114.3mm127.0mm, 139.7mm, 168.3mm, 177.8mm, 193.6mm244.5mm, 339.7mn casing size series, water loss control at positive difference 6.9MPa, time 30min, see Table 2. Table 2
Camp size
Outer casing size
Crown pipe type
Drilling tail pipe
Lanzhou tail pipe
300~250
<200～150
150～100
200-150
150~50
150100
7 Tail pipe cementing operation
7.1 Tail pipe lowering
7.1.1 Lowering speed
a. Not more than 35m/min before connecting the hanger
SY/T 5475--92
b. After the hanger is connected, the column is lowered at a speed of no more than 18m/minc, and 12~~15m/mind through the permeable and leak-prone formation.
7.1.2 Threaded connection
Use thread sealant that complies with SY5198 and SY5199, and connect the drill pipe and casing according to the specified torque. When the tail pipe is lowered with the drill pipe, lock the turntable pin.
7.1.3 Grouting in the pipe
a. Fill the tail pipes once for every 15~20 pipes,
b. Fill the drill pipe column once for every 3 columns, and then lower it to the outer casing shoe, fill it with drilling fluid, and circulate it for 15~20minsG. In the open hole, fill the hole once for every column: d. For the white filling device, check the hanging weight once for every 5 to 10 columns. 2 Hanger Sitting
7.2.1 Preparation and Seat Setback
a. After the tail pipe is lowered to the designed tail pipe shoe depth, add the lower section retraction moment as the tail pipe shoe depth, and then lift it to the designed well depth. Shoe depth: Calculation see formula (2)
D-(Li+)+2+a+L
Wu Zhong: D—tail pipe shoe depth, m,
2L retraction distance, m!
L, the length of the drill string from the bottom of the uppermost drill pipe joint to the end of the seat ring, m2L2-hanger length, 3
L3-tail pipe length, mJ
L length of the matching joint and the tail pipe shoe (guide shoe): m(2)
b, to implement the seat hanging, a retraction distance should be lowered to unload the tail pipe load and make the cementing wellhead device close to the rotary table surface. c. Seat hanging judgment, there is no sticking condition in the well, the length of the drill string lowered is equal to (or close to) the retraction distance, and the corresponding load is equal to the tail pipe load. 了,2.2 Circulation
After the seat hanging and before the cementing, the circulation and treatment of the drilling fluid shall be not less than two weeks, and the performance shall meet the design requirements. 7.3 Backlash
a,-lift the drill string to make the hanger force in the state of vehicle force point, b. The speed is less than 60r/rnin, and the number of backlash turns shall not exceed the maximum allowable number of twisting turns c. Control the reverse speed of the drill string to prevent the drill string from being loosened. d. The turntable does not reverse. Lift the drill string. Use the hanging weight to determine whether the left-hand thread at the hanger is reversed. It is strictly forbidden to lift the center pipe out of the hanger. e. After the screw is screwed in successfully, lower the drill string and apply 30 to 50 kN of pressure on the hanger. 7.4 Cement injection
7.4.1 Pre-fluid
a: According to the provisions of SY/T5374 standard,
b. Pre-fluid can be used as part of the turbulent displacement contact liquid volume. The contact time of the plain flow is not less than 7minsc. The amount is calculated based on the annular volume of the tail pipe and the open hole. The filling height is controlled at 80 to 200m. 7.4.2 Preparation of cement slurry
SY/T 5475-92
Use batch or secondary slurry method to ensure uniform density. 7.4.3 Item registration
a. The pressure difference of the hydrostatic pressure inside and outside the tail pipe section should be less than 4.0MPa, and the density of the drilling fluid replaced in the tail pipe section is determined accordingly; b. The compression coefficient is not considered for the volume of the drill string, and 3% is added to the volume of the casing; center, displacement, according to the rheological design requirements, to achieve the best replacement efficiency, d. After the design volume (including the compression coefficient) is replaced without collision pressure, when it is necessary to replace again, it shall not exceed 1% of the total amount e. The collision pressure is stabilized for 3 to 5 minutes, and then released. Only when it is judged that the back pressure device is reliable can the center replacement be raised from the hanger. 7.4.4 Flushing
a. Lift the height of the drill string according to the design requirements, and wash the super cement until all of it returns to the port, b. After flushing, pull the drill according to the design or lift it to a certain height to wait for solidification. When pulling the drill, the well should be filled with drilling fluid. 7.5 Drilling cement plug and pressure test
7.5.1 Drilling plug
a, first drill out the residual cement above the seat ring
b, replace the drill bit that matches the inner diameter of the tail pipe, remove the sealing ring of the inner hole of the hanger and mill the artificial bottom of the well or the position of the flow ring specified by the milling barrier G, after drilling the cement plug, conduct an acoustic amplitude test to check the cement quality. 7.5.2 Pressure test
After measuring the acoustic amplitude, according to the performance of the outer casing and the type of tail pipe, conduct a pressure test. 7.6 Tail pipe cementing quality
7.61 Same as the requirements for casing cementing quality, check the flow ring or artificial bottom and magnetic positioning depth according to the design. Sound amplitude check cement ring quality, the amplitude is less than 30% to be qualified.
7.6.2 Tail pipe must be suspended, and the tail pipe is not allowed to bend under pressure. 7.6.3 If the pressure test is qualified, the tail pipe strength shall meet the requirements of 5Y/T5322. 7.6.4 Cement returns to the hanger seat ring depth or design depth. Additional remarks:
This standard is proposed and managed by the Petroleum Drilling Engineering Professional Standardization Committee. This standard was drafted by the Second Exploration Company of the North China Petroleum Administration Bureau. The main drafter of this standard is Xu Huifeng.
This standard is still valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.If the speed is less than 60r/min, the number of reverse turns shall not exceed the maximum permissible number of twisting circles. c. Control the reverse return speed of the drill string to prevent the drill string from being loosened. d. The turntable does not reverse. Lift the drill string. The hanging weight is used to determine whether the left-handed thread at the hanger is reversed. It is strictly forbidden to lift the center pipe out of the hanger. e. After the screw is completely screwed, lower the drill string and apply 30 to 50 kN of pressure on the hanger. 7.4 Cement injection
7.4.1 Pre-fluid
a: According to the provisions of SY/T5374 standard,
b. Pre-fluid can be used as part of the turbulent displacement contact liquid. The contact time of the plain flow is not less than 7minsc. The amount is calculated based on the annular volume of the tail pipe and the open hole. The filling height is controlled at 80 to 200m. 7.4.2 Preparation of cement slurry
SY/T 5475-92
Use batch or secondary slurry method to ensure uniform density. 7.4.3 Item Log
a. The pressure difference of the hydrostatic pressure inside and outside the tail pipe section should be less than 4.0MPa, and the density of the drilling fluid replaced in the tail pipe section is determined accordingly; b. The compression additional coefficient is not considered for the volume of the drill string, and the volume of the casing is increased by 3%; center, displacement, according to the rheological design requirements, to achieve the best item replacement efficiency, d. After the design volume (including the compression coefficient) is replaced without collision pressure, when it is necessary to replace again, it shall not exceed 1% of the total amount e. The collision pressure is stabilized for 3 to 5 minutes, and then released. The center replacement can be lifted out of the hanger only after judging that the back pressure device is reliable. 7.4.4 Flushing
a. Lift the height of the drill string according to the design requirements, and wash the excess cement until all of it is returned and ported, b. After flushing, pull the drill out according to the design or lift it to a certain height for solidification. When pulling the drill out, the well should be filled with drilling fluid. 7.5 Drilling cement plug and pressure test
7.5.1 Drilling plug
a, first drill out the residual cement above the seat ring
b, replace the drill bit that matches the inner diameter of the tail pipe, remove the sealing ring of the inner hole of the hanger and mill the artificial bottom of the well or the position of the flow ring specified by the milling barrier G, after drilling the cement plug, conduct an acoustic amplitude test to check the cement quality. 7.5.2 Pressure test
After measuring the acoustic amplitude, according to the performance of the outer casing and the type of tail pipe, conduct a pressure test. 7.6 Tail pipe cementing quality
7.61 Same as the requirements for casing cementing quality, check the flow ring or artificial bottom and magnetic positioning depth according to the design. Sound amplitude check cement ring quality, the amplitude is less than 30% to be qualified.
7.6.2 Tail pipe must be suspended, and the tail pipe is not allowed to bend under pressure. 7.6.3 If the pressure test is qualified, the tail pipe strength shall meet the requirements of 5Y/T5322. 7.6.4 Cement returns to the hanger seat ring depth or design depth. Additional remarks:
This standard is proposed and managed by the Petroleum Drilling Engineering Professional Standardization Committee. This standard was drafted by the Second Exploration Company of the North China Petroleum Administration Bureau. The main drafter of this standard is Xu Huifeng.
This standard is still valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.If the speed is less than 60r/min, the number of reverse turns shall not exceed the maximum permissible number of twisting circles. c. Control the reverse return speed of the drill string to prevent the drill string from being loosened. d. The turntable does not reverse. Lift the drill string. The hanging weight is used to determine whether the left-handed thread at the hanger is reversed. It is strictly forbidden to lift the center pipe out of the hanger. e. After the screw is completely screwed, lower the drill string and apply 30 to 50 kN of pressure on the hanger. 7.4 Cement injection
7.4.1 Pre-fluid
a: According to the provisions of SY/T5374 standard,
b. Pre-fluid can be used as part of the turbulent displacement contact liquid. The contact time of the plain flow is not less than 7minsc. The amount is calculated based on the annular volume of the tail pipe and the open hole. The filling height is controlled at 80 to 200m. 7.4.2 Preparation of cement slurry
SY/T 5475-92
Use batch or secondary slurry method to ensure uniform density. 7.4.3 Item Log
a. The pressure difference of the hydrostatic pressure inside and outside the tail pipe section should be less than 4.0MPa, and the density of the drilling fluid replaced in the tail pipe section is determined accordingly; b. The compression additional coefficient is not considered for the volume of the drill string, and the volume of the casing is increased by 3%; center, displacement, according to the rheological design requirements, to achieve the best item replacement efficiency, d. After the design volume (including the compression coefficient) is replaced without collision pressure, when it is necessary to replace again, it shall not exceed 1% of the total amount e. The collision pressure is stabilized for 3 to 5 minutes, and then released. The center replacement can be lifted out of the hanger only after judging that the back pressure device is reliable. 7.4.4 Flushing
a. Lift the height of the drill string according to the design requirements, and wash the excess cement until all of it is returned and ported, b. After flushing, pull the drill out according to the design or lift it to a certain height for solidification. When pulling the drill out, the well should be filled with drilling fluid. 7.5 Drilling cement plug and pressure test
7.5.1 Drilling plug
a, first drill out the residual cement above the seat ring
b, replace the drill bit that matches the inner diameter of the tail pipe, remove the sealing ring of the inner hole of the hanger and mill the artificial bottom of the well or the position of the flow ring specified by the milling barrier G, after drilling the cement plug, conduct an acoustic amplitude test to check the cement quality. 7.5.2 Pressure test
After measuring the acoustic amplitude, according to the performance of the outer casing and the type of tail pipe, conduct a pressure test. 7.6 Tail pipe cementing quality
7.61 Same as the requirements for casing cementing quality, check the flow ring or artificial bottom and magnetic positioning depth according to the design. Sound amplitude check cement ring quality, the amplitude is less than 30% to be qualified.
7.6.2 Tail pipe must be suspended, and the tail pipe is not allowed to bend under pressure. 7.6.3 If the pressure test is qualified, the tail pipe strength shall meet the requirements of 5Y/T5322. 7.6.4 Cement returns to the hanger seat ring depth or design depth. Additional remarks:
This standard is proposed and managed by the Petroleum Drilling Engineering Professional Standardization Committee. This standard was drafted by the Second Exploration Company of the North China Petroleum Administration Bureau. The main drafter of this standard is Xu Huifeng.
This standard is still valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.